Abrasive head



June 17, 1952 G. w. BRUNER I :T AL 2,600,613

ABRASIVE HEAD Filed July 21, 1951 2 SHEETS-SHEET l June 17, 1952 G. w. BRUNER ET A1.

ABRASIVE HEAD 2 SHEETs-SHEET 2 Filed July 21, 1951 Patented June 17, 1952 UNITED PAT ENT: 2;600,6131

ABRASIVE HEAD George W. Bruner and Joseph C'. Shaffer, Indian-` apolis', Ind., assignors to- Vonnegut: Moulder (lorporatiom. Indianapolis, Ind., a cornotion Application July 2,1, 1951,I Serl'alNo. 237;@4

8' Claims. 1

Thisinventon relates to an abrasive head; for sanding,l polishing and finishing wood and other materials,A including moul'dings, carvings, die cast.- ings andthe like, and ofthe general type dis'- cl'osed in Letters Patent to Plengemeier' No. 2,125,460', granted August 2', 1938, and Letters Patent to Bradley No. 2,430,099', granted November 4, 1947.

Itis thepurpose of" this invention to improve upon the, loading and'V feeding of the abrasive strips, whereby the head may be more readily andA safely loaded and the, abrasive strips adjustably fed' therefrom with less delay and through a simpler operation than therefore. Through' the medium of this invention it' is also possible to' accurately controlV the feeding out of the abrasive strips to a predetermined and controlled extent.

The principal feature of the invention, therefore',v resides' in the provision of a removable but xed cap plate having an external annular series o'f serrations or teeth provided in the surfacej thereof' in association with an adjusting collar having mating serrations or teeth, and removably coupled with the Winding drumr or. hub about which the abrasive strips are wound in the head; Such provision of meshing serrations or teeth provides'a positive lock to' hold the store of abrasive'` in the' head, as distinguished' from friction gripping' as employed in` the, above-mentioned Letters' Patent. Such interlocking of the serrations or teeth has the additional' feature of eliminatingl any chance cf'all the abrasive beingv accidentally unloaded or' released at one time throughcarelessness or lack'of strength in tightening' the' spindle nut. In operation such vajccidental release is both dangerous and damaging, and, therefore', this feature of the invention provides a substantial safety factor such as to inspire` greater confidence in the operator when using the head.

Also'Y by means of this arrangement and without removing the capl plate, it is only necessary to back oif'Y the clamping nut on the=spindlesu ciently to` release-the serrations or teeth-which Willa permit the' adjusting collar torotate' the winding' hub through a predeterminediang-ular displacement determined by the number of serrations or teeth` between its forn'ler'posi-tion` andl its adjusted position.

By means of this arrangement not only may the abrasive strips be quickly wound upon` the hub, but after use they may be fed out to the extent of: the predetermined-number of serrations in asimple and'-most'facilefcperation.withaminimum of time and effort expended thereon to'. bring the head to. a new adjustment.

The full nature ofthe'v invention will lne-understood from the accompanying drawings== and the, followingl description and claims :1

Fig. 1 is a forward end elevation of' the abrasive. head with the adjusting` collar removed and et portionof the-end plate broken away.

Fig; 2f is a section taken on the line 2--21'l ci? Fig. I Withthe adjusting collar in lockedf posi-r OI;

Fig. 3` is a perspectiveV View' of the inner side. of the adjusting collar.

Fig. 4 is a perspective view-of therwfindingf drum.

As illustrative ofA` one form of the invention' there is shown an abrasive head mounted-- on a spindle l0 and clamped securelythereon for operation by a lock nut I Il, the head being slidably. mounted over the spindle when the clamping nut' is screwedfrom the threaded' end: thereoff.

The abrasive headincludes a rear'h-ubE member I2' to which is secured a rear base plate i131. 0p-vv posite and in spaced relation to said base plate; there isa conforming and mating cap plate I4 between whichy the brushes and' the abrasives'fare.:

carried. The head also' includes a series otra-e..

dially--extending brushes l-fhaving their bristles. secured' in the brush-heads H which are: wedge-` shaped incross section iso-slidelongitudinally of. and be interlocked-within U--shapedlorushhol'dl-A ers l1. lorfA this purpose there isV provided. an4

annular series of brush holders and-k brushes,

saidv brush holders being flanged attl'ieirv inner end, as indicatedY at I8,vto berigi'dlysecuredito the base platev I3 by the anchor bolts I Said'- seri'es of brush holders is anchored at their op-f positeendsby the cap platewhich. formed"A witha' series of apertures ZtlV removablyembracingthe free outer ends of the brush' holders.

The hub I2 is formed with an inwardly pro-- jecting annular boss portion 2|: aboutwhichV a Winding' drum or anchor cylinder 2-2f is centered, and seated' for rotation' relative thereto. Saidlf drum= is-conlined for rotation: betweenV thebase plate 1.3` and cap plate lill through. end thrust.V bearing engagement therewith. Saidfr winding,- drumf, asf shownV in Iig',V 4, is provided'with an ,anlnular series ofl bores123 having an open slotfindicated at 24; hereinV shown, said drum is, provided with four-of said bores equally spacedA thereabout extending from end: to. end' thereof: Each of saidv bores is adapted toreceive therein an anchorpin 25 of substantially less diameter. than the diameter of' the bore.

Slidably receivable over and` about. each oi the anchoring -pinslthere-,is slidably mounted arrabra,-n sive` loading or" assembly. Each abrasive loading, includes` a. looped fabric anchor. portion. 26.' proa vided with one or more outwardly projecting wing portions 21 to which there is secured one or more abrasive strips 28, as shown in Fig. 1. In this manner a relatively few abrasive loadings may provide anchorage for a large number of abrasive strips. For example, as shown herein there is provided four anchor pins to receive four abrasive loading assemblies, each abrasive loading providing four individual abrasive strips, making sixteen in all, to extend radially and outwardly between the sixteen brushes as illustrated.

For rotating the winding drum to wind the series of abrasive strips thereabout and periodically unwind them to feed them outwardly as they become worn, said drum iformed with a pair of opposed keyways 29 adjacent the cap plate. The internal bore of said drum is of a diameter to be free of the spindle l and of the depth of the keyways 29. It is offset at 3D to receive the shank 3l of an adjusting collar 32 (Fig. 3). The internal bore of said collar, as indicated at 33, provides a supporting bearing for the outer end of the head rotatable upon the end of the spindle I0. The inner portion of the shank has its bore oset free of the spindle, as indicated at 34, and is provided with keys in the form of laterally bent ears 35 slidable in the keyways. Thus, through the interlock between the keys and keyways rotation of the adjusting collar 32 will effect rotation of the winding drum in either direction.

Said adjusting collar has an enlarged head peripherally knurled at 36, and on the underside thereof there is formed an annular series of serrations or locking teeth 31 arranged to mate and interlock with a corresponding annular series of serrations or locking teeth 38 formed on the outer surface of the cap plate. Said cap plate is further provided with opposed slots 39 adapted to be aligned with the keyways 29 for passage into said keyways of the keys 35.

In operation, to load the head the lock nut l l is removed from the spindle which permits removal of the adjusting collar. Thereupon the cap plate may be withdrawn, exposing the winding drum 22 and anchor pins 25. The loadings, shown in Fig. l, may then be slipped in place over the pins with the abrasive strips separated to extend between their respective brushes. After loading, the cap plate is mounted in position, as shown in Figs. 1 and 2, and the adjusting collar is inserted therethrough into interlocking engagement with the winding drum. Holding the adjusting collar out of teeth engagement with the cap plate it may be rotated for winding the abrasive about the drum until only the extreme ends of the strips extend outwardly to the periphery of the brushes.

The teeth are then engaged and the nut l l secured over the spindle. The spindle is given a few revolutions sufciently to tighten up the winding of the abrasive about the drum, whereupon the nut Il is removed, the teeth of the adjusting collar disengaged and the adjusting collar operatedto give nnal adjustment to the tip ends of the abrasive strips relative to the brushes. The teeth are then reengaged and the nut l l applied, whereupon the head is in readiness for operation with a new loading.

As the outer ends of the abrasive strips become worn and damaged, it is desirable to feed them out to a predetermined length. It is for this purpose that the invention is particularly useful and applicable in that it is then only necessary to back off the nut Il sufficiently far to slide the adjusting collar on the spindle for disengagement of the teeth. The adjusting collar may then be rotated in the proper direction for causing the drum to move in its unwinding direction. Through the medium of the series of teeth, this adjustment may be predetermined and gaged so that precisely the desired amount of outward feeding of the strips may be accomplished. Thus, rotation of the collar through a series of six teeth may be the predetermined adjustment to present the desired amount of new abrasive, or it may be twice that number of teeth or any other determined number. This may be very quickly and accurately accomplished, the teeth of the collar reengaged and the nut Il tightened up. Thereupon, the head is ready for additional operations with the proper amount of fresh abrasive exposed beyond the brushes.

The invention claimed is:

l. In an abrasive head to be driven by a driving spindle including opposed plates for mounting therebetween a series of radially-extending brushes, and a locking nut threaded on the end of the spindle for securing said head thereon, the combination therewith of an abrasive winding drum rotatable about said spindle between said plates, a series of anchor pins carried by said drum for receiving and anchoring a plurality of abrasive loadings to be wound thereon including individual abrasive strips extending radially between said brushes, said drum having a keyway extending longitudinally from one end thereof, an abrasive adjusting collar having a sleeve portion extending through one of said plates to provide a supporting bearing therefor upon said spindle, a key carried by said sleeve portion slidable into driving engagement with said keyway for rotating said drum, an annular series 0f teeth formed on said last-mentioned plate exposed to said collar, and a corresponding series of teeth on said collar positioned to engage with said nrst-mentioned teeth for interlocking said collar and plate, upon said locking nut being tightened thereon, said collar being movable axially of said drum and plate upon said nut being backed off to permit disengagement of said teeth and predetermined angular displacement of said drum according to the number of teeth on said plate traversed by the teeth on said collar.

2. In an abrasive head to be driven by a driving spindle including opposed plates for mounting therebetween a series of laterally-extending brushes, and a locking nut threaded on the end of the spindle for securing said head thereon, the combination therewith of an abrasive winding drum rotatable about said spindle between said plates, a series of anchor pins carried by said drum for receiving and anchoring a plurality of abrasive loadings to be wound thereon, said drum having a keyway in one end thereof, an abrasive adjusting collar having a driving key extending from one of said plates into driving engagement with said keyway for rotating said drum, an annular series of teeth formed on said last-mentioned plate exposed to said collar, and a corresponding annular series of teeth on said collar positioned to engage with said first-mentioned teeth for interlocking said collar and plate upon said locking nut being tightened thereon, said collar being movable axially of said drum and plate upon said nut being backed olf to permit disengagement of said teeth and predetermined angular displacement of said drum according to the number of teeth on said plate traversed by said teeth on said collar.

3, In an abrasive head to be driven by a driving spindle including opposed plates for mounting a series of radially-extending brushes, and an abrasive winding drum rotatably mounted about said spindle between said plates, the combination therewith of an abrasive adjusting collar having a portion thereof extending through one of said plates into rotative engagement with said drum and axially displaceable relative thereto, an annular series of teeth formed in said lastmentioned plate exposed to said collar, a corresponding annular series of teeth on said collar positioned to engage with said first-mentioned teeth for interlocking said collar and plate, and a locking nut engageable with said collar for clamping it in teeth interlocking position for securing said drum and plates against relative rotation, said collar being movable axially of said drum and plate upon said nut being backed oi in spaced relation thereto for permitting disengagement of said teeth and predetermined angular displacement of said drum.

4. In an abrasive head to be driven by a driving spindle and having a pair of spaced plates for mounting therebetween a series of radial brushes, and a winding drum rotatable between said plates carrying abrasive strips adapted to extend outwardly between said brushes, the combination therewith of an exposed abrasive adjusting member having a projection extending through one of said plates into interlocking engagement with said drum for rotating the same to wind up and let out said abrasive strips, an annular series of disengageable interlocking teeth between said adjusting member and its adjacent mounting plate for locking said drum to said plate when engaged, said member being angularly displaceable to a predetermined extent relative to said plate for permitting rotation of said winding drum when axially moved to a position for freeing said teeth, and a lock engageable with said member for securing it against said plate for operation oi said head when said lock is in one position and free said member from said plate for rotation of said drum when in another position.

5. In an abrasive head to be driven by a driving spindle and having a pair or spaced plates for mounting therebetween a series of radial brushes, and. a winding drum rotatable between said plates carrying abrasive strips adapted to extend outwardly between said brushes, the combination therewith of an exposed abrasive adjusting collar having interlocking engagement with said drum for controlling the rotation thereof to wind up and let out said abrasive .r

strips, an annular series of disengageable interlocking teeth between said adjusting collar and its adjacent mounting plate for locking said drum to said plate when engaged, said collar being angularly displaceable relative to said plate for permitting rotation of said, winding drum when axially moved to a position for freeing said teeth, and a clamping lock movable into clamping engagement with said collar for securing it against said plate for operation of said head and freeing said collar from said plate to permit rotation of said drum.

6. In an abrasive head to be driven by a driving spindle and having a pair of spaced plates for mounting therebetween a series of radial brushes, and a winding drum rotatable between said plates carrying abrasive strips adapted to extend outwardly between said brushes, the combination therewith of an exposed abrasive adjusting collar having a projection extending through one of said plates into interlocking engagement with said drum for controlling the rotation thereof to Wind up and let out said abrasive strips, disengageable interlocking elements interposed between said adjusting collar and its adjacent mounting plate for locking said drum to said plate when interengaged, said collar being axially displaceable for freeing said interlocking elements to permit rotation of said drum relative to said plate, and means for clamping said collar against said plate with said elements interlocked.

7. In an abrasive head, an annular base plate, an annular series of brush holders secured thereto and extending about the periphery thereof at right angles to its plane, a corresponding ann nular cap plate having an annular series oi" apertures formed about the periphery thereof for slidably receiving and interlocking with the free ends oi said brush holders, an abrasive winding drum rotatably mounted and centered between said plates, said plates being arranged for rotatable support on a spindle having a threaded end extending adjacent to and beyond said cap plate, an abrasive adjusting collar rotatable about the threaded end of said spindle, means on said collar for interlocking said drum and plate against relative rotation, and a clamping nut threaded on the end of said spindle for clamping said collar and plate in interlocking connection with said brush holders.

8. In a abrasive head, an annular base plate, an annular series of brush holders secured thereto and extending about the periphery thereof at right angles to its plane, a corresponding annular cap plate having an annular series of apertures formed about the periphery thereof for slidably receiving and interlocking with the free ends of said brush holders, an abrasive winding drum rotatably mounted and centered between said plates, said winding drum having an annular series of longitudinally slotted bores, an abrasive anchoring pin in each of said bores, said plates and drum being apertured to receive a supporting spindle threaded at one end adjacent said cap plate, an abrasive adjusting collar rotatably mounted on the free end of said spindle, a key and slot driving connection between said collar and drum, an annular series of interlocking teeth between said collar and plate, and a clamping nut threaded on the end of said. spindle for clamping said collar, plate and drum in driving relation with said brush holders while permitting disengagement of said teeth for adjustment ci said drum by said collar upon said clamping nut being backed away.

GEORGE W'. BRUNER. JOSEPH C. SHAFFER.

REFERENCES CTED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name l Date 2,194,577 Vonnegut Mar. 25, 1940 2,413,165 Bonkowski Dec. 24, 1946 2,418,956 Bonkowski Apr. l5, 1947 2,430,099 Bradley Nov. 4, 1947 2,439,962 Bonkowski Apr. 20, 1948 2,474,063 Newton June l, 1949 2,522,920 Blates Sept. 19, 1950 2,533,619 Pokras Dec. 12, 1950 

